docs: add changelogs for 1.11.10, 1.11.11, 2.0.3, 2.0.4, 2.0.5, 2.0.6…

…, 2.1.0, and 2.1.1 (#9554)

* docs: prepare changelog for 2.1.0 beta

* docs: move changelog for 2.0.x to stable

* docs: add changelog for legacy 1.11.x

* docs: add release notes for 2.0.x beta releases

* docs: mark 1.11 end of life

* docs: prepare release notes for 2.0.5 stable

* docs: prepare release notes for 2.1.0 beta

* ci: ignore docs in tests

* docs: bump version in readme

* docs: update changelog for 2.0.5 stable

* docs: update changelog for 2.1.0 beta

* docs: update changelog for 2.1.0 beta

* docs: remove eip86 from release notes

* docs: update changelog for 2.1.0

* docs: add changelog for 2.1.1 and 2.0.6

* docs: correct spelling of certain words in the latest changelog